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What is an acute angle?
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Angle less than 90
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What is a right angle?
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Angle that is exactly 90 degrees.
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What is an obtuse angle?
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More than 90, < 180 degrees.
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What is a straight angle?
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Exactly 180 degrees
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What is a complementary angle?
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Two angles that add to 90 degrees.
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What are supplementary angles?
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Two angles that add to 180 degrees.
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What is a transversal line?
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When parallel lines get crossed by another line, that line is called a Transversal.
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What is true about vertical or opposite angles?
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Vertical (or opposite) angles are equal.
a = b
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What are congruent angles?
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Congruent angles have the same angle in degrees.
They don't have to point in the same direction, and they don't have to be on similar sized lines.
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What are the corresponding angles?
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When two lines are crossed by the transversal line, the angles in matching corners are called corresponding angles.
The corresponding angles are:
a and e
b and f
c and g
d and h
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What are the Alternate Interior Angles?
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The pairs of angles on opposite sides of the transversal but inside the two lines.
The Alternate Interior Angles are:
c and f
d and e
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What are the alternate exterior angles?
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The pairs of angles on opposite sides of the transversal but outside the two lines are called Alternate Exterior Angles.
The Alternate Exterior Angles are:
a and h
b and g
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Same side interior angles are...
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Supplementary - or they add up to 180.
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What is a scalene triangle?
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No equal sides
No equal angles
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What is an isosceles triangle?
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2 equal sides
2 equal angles
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What is an equilateral triangle?
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Triangle with 3 equal sides
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Each angle of an equiangular triangle is?
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60 degrees
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For a triangle - the sum of any 2 sides is always ______ than the 3rd side
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larger
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What is the pythagorean theorem?
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a^2 + b^2 = c^2
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The acute angles of a right triangle are __________
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Complementary (or add up to 90 degrees)
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1 ^2
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1
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2 ^2
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4
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3 ^2
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9
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4 ^2
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16
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5 ^2
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25
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6 ^2
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36
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7 ^2
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49
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8 ^2
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64
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9 ^2
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81
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10 ^2
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100
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11 ^2
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121
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12 ^2
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144
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13 ^2
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169
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14 ^2
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196
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15 ^2
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225
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16 ^2
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256
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17 ^2
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289
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18 ^2
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324
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19 ^2
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361
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20 ^2
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400
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21 ^2
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441
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22 ^2
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484
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23 ^2
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529
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24 ^2
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576
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25 ^2
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625
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What are Pythagorean Triples?
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These are sets of whole numbers which fit the rule:
a^2 + b^2 = c^2
(3,4,5)
(5,12,13)
(7,24,25)
(8,15,17)
(9,40,41)
(11,60,61)
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What is the perimeter of triangle ABC?
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Perimeter = A + B + C
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How do you calculate the area of a triangle from its sides?
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Step 1: Calculate "s" (half of the triangles perimeter)
s = (a + b + c)/2
Step 2: Then calculate the Area (A)
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What is the area of a triangle?
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Area = ½b×h
b = base
h = vertical height
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