Question

Give me answer for b

Answer 1

Answer:

area of fig.ABCDE=arΔabc+arΔace+arΔecd=(140+21√39)/4

Step-by-step explanation:

arΔabc= 1/2 × base×height=1/2×10×2= 10 cm²

arΔecd=1/2×base×height= 1/2×10×5=25 cm²

arΔace=b/4×√4a²-b²=7/4× √400-49=7/4×√351=7/4×3√39=21/4√39cm²

adding all we get=25+10+21/4√39=(100+40+21√39)/4 =(140+21√39)/4