Question

Total surface area of the following closed figure is __units2.

(A) 25

(B) 45

(C) 31

(D) 40

Answer 1

Correct option (C) 31

Explanation:

Corrected figure

Area of square ABCD = 3 x 3 = 9 unit2

Area of square CGHF = 4 x 4 = 16 unit2

Area of ΔCDG = 1/2 x 4 x 3 = 6 unit2

Total surface area = 9 + 16 + 6 = 31 unit2