Correct option is A
Given:
BD = 20 cm
Height of triangle ABD = 6 cm
Height of triangle BCD = 8 cm
Formula Used:
Area of triangle = ×Base×Height
Area of quadrilateral = Sum of areas of two triangles formed by one diagonal
Solution:
Area of quadrilateral ABCD = Area of triangle ABD + Area of triangle BCD
Area of quadrilateral ABCD =
Area of quadrilateral ABCD = 60 + 80 = 140 sq. cm.