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5-Minute Check on Lesson 11-1

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Transparency 11-2

5-Minute Check on Lesson 11-1

- Find the area and the perimeter of each parallelogram. Round to the nearest tenth if necessary.
- 2.
- 3. 4.
- TRY: Find the height and base of this parallelogram if the area is 168 square units

17 ft

11 cm

13 cm

12 ft

45°

11 in

60°

18 in

6.3 m

x + 2

x

Click the mouse button or press the Space Bar to display the answers.

Lesson 11-2 Day 1

Areas of Triangles

R

Triangle Area

A = ½ * b * h

h is height (altitude)

b is base (┴ to h)

h

T

S

W

R

Find the area of triangle RST

h

45°

S

T

W

10

10

EXAMPLE 2

Find the area of quadrilateral ABCD if AC = 35, BF = 18, and DE = 10.

EXAMPLE 3

Find the area of quadrilateral HIJK if IK = 16, HL = 5 and JM = 9

- Find the area of the triangle whose vertices are (3,6), (7,6) and (3,1).

- Find the area of the parallelogram whose vertices are (0,0), (4,0), (5,5), and (1,5)

Summary:

The formula for the area of a triangle can be used to find the areas of many different figures

Congruent figures have equal areas

Classwork:YOU MUST SHOW WORK!!!!!

pg 605 (5,13, 14, 19, 20, 34, 35)

pg 599 (21-25 and page 605 #7) Plot points first then find the area of each!!!