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Perimeter Rectangle
Perimeter Square
Area Rectangle
Area Triangle
100

L = 2 cm W = 4 cm

P = 12 cm

+100

100
s = 2 m
P = 8 m
100

L = 3 km W = 4 km

A = 12 km2

(-100)

100

b = 4 in h = 5 in

A = 10 in2

200
L = 8 in W = 11 in
P = 38 cm
200

s = 6 m

s = 24 m

(-200)

200

L = 8 mm W = 7 mm

A = 56 mm2

(+500)

200

b = 13 m h = 2 m

A = 13 m2

(-1000)

300

L = 27 km W = 35 km

P = 124 km

(+1000)

300

s = 18 cm

P = 72 cm

(-300)

300
How is the area of a triangle related to the area of a rectangle?
Cut the rectangle diagonally.
300
Area = 32 m2 Base = 8 m
Height = 8 m
400

L = 41 mm W = 59 mm

P = 200 mm

(-400)

400
P = 84 in
s = 21 in
400

A = 126 mm2 W = 14 mm

L = 9 mm

400
Area = 196 cm2 Base = 14 cm
Height = 28 cm
500
P = 296 km L = 111 km
W = 37 km
500
P = 156 dm
s = 39 dm
500
L = 6 cm W = 5 cm If I double the sides, what's the ratio of the new area to the old area?
4:1
500

The base of the triangle is 6 km. The height of the triangle is also 5 km. If I triple the base and double the height, what is the ratio of the area of the new triangle to the area of the old triangle?

6:1

(-500)