18 - Geometry Flashcards
(90 cards)
1
Q
Two equations for Area of a Triangle (not equilateral)
A
1/2 * base * height
(leg*leg)/2
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Similar shapes: ratio of the side is x:y, the ratio of the area is
x2:y2
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One way to estimate the area of a triangle is by
dividing it into smaller shapes.
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Arc angle =
Central angle
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Angle adjacent to arc is
1/2 the Central Angle
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Equation for Equilateral Triangle
s2(radical 3)/4
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What is the measure of angle ADB?
There is not enough information to know. Don't assume that a line cutting through the 90 degree angle cuts it in half. In this case it is 50 degrees.
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90
Isosceles Triangle when a line is drawn from base to altitude is
Cut into two equal triangles
