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11.2 Areas of Triangles, Trapezoids, and Rhombi. What you’ll learn: To find areas of triangles To find areas of trapezoids and rhombi. Area of a Triangle. A=½bh Ex: Find the area of ABC. Area of a Trapezoid. b. h. b. Area of a Rhombus. A. B. If AC=20 and BD=24 The area would be - PowerPoint PPT Presentation
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11.2 Areas of Triangles, Trapezoids, and Rhombi
What you’ll learn:1. To find areas of triangles
2. To find areas of trapezoids and rhombi.
Area of a Triangle
A=½bhEx: Find the area of ABC
Area of a Trapezoid
1 2
1( )
2A h b b
b
b
h
Area of a Rhombus
If AC=20 and BD=24The area would be A=½2024A=240 inches²
1 2
1
2A d d
A B
CD
Find the area of quadrilateral ABCD if AC=35, BF=18, and DE=10
A=490 units²
AB
CD
E
F
Find the area of trapezoid RSTU with vertices R(4,2), S(6,-1), T(-2,-1),
and U(-1,2)
Find the area of rhombus MNPR with vertices at M(0,1), N(4,2), P(3,-2), and R(-1,-3)
Rhombus RSTU has an area of 64 square inches. Find US if RT=8 in.
R S
TU
Homeworkp. 14-34 even
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