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