Question

10 cm
10 cm
10 cm
20 cm
area: ________
7)
12 yd
10 yd

Explanation:

Step1: Divide shape into rectangles

Split into two rectangles. One with sides 10 cm and 20 cm, another with sides 10 cm and (10 + 10) cm.

Step2: Calculate area of first rectangle

$A_1=10\times20 = 200$ $cm^2$

Step3: Calculate area of second rectangle

$A_2=10\times20 = 200$ $cm^2$

Step4: Calculate total area

$A = A_1+A_2=200 + 200=400$ $cm^2$

Answer:

$400$ $cm^2$