Find the area of a rectangle with base 40 cm and height 2 m

0.8 sq. m.

Step-by-step explanation:

Basev= 40 cm = 0.4 m

Area = base x height

Area = 0.4 x 2m

Area = 0.8 sq. m.

c

-by-step explanation:

it would be c

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.