Question

find the area of the sector whose radius is 3.5cm with the given angle 72degree ​

Answer 1

let's write formula for finding sector :

given angle/360×πr²

Data: given angle = 72

radius (r) = 3.5 (let's take it as 7/2=3.5)

let's apply data to formula

72/360×22/7×7/2×7/2

36/360×11×7

1/10 ×77

1×7.7

7.7cm²