Download Warm Up Find the area of an equilateral triangle with side of 12

Warm Up
Find the area of an equilateral triangle with side of 12 inches.
Warm Up
Find all the missing sides.
5√2
30°
45°
5-5 Areas of Trapezoids
Objective: Find the areas of trapezoids
1. Arrange trapezoids to form
parallelogram.
2. Write an expression for the
b1
h
b2
area of the parallelogram.
3. Write a formula for the area
of each trapezoid.
b1
h
b2
b1
h
b2
Theorem 5-8: The area of a trapezoid
is half the product of the height and the
sum of the lengths of the bases.
A = ½h(b1 + b2)
Example: Find the area of the trapezoid.
121 in
42 in
145 in
Example: Find the area of the trapezoid.
21 cm
45°
25 cm
Find the area of the trapezoid.
35 cm
60°
45 cm
HW # 57
p. 271 # 1-5, 7, 9-12
** Quiz Friday 5.3-5.6
Pythagorean Spiral Project--
Due by Wednesday!
Geometry Exam News
2-day exam will be given
Wed. & Thurs. Jan 14/15