Question

 (40°/360°)×πr²cm²

= 68.44 cm²
how this came
radius =7(or)r=7​

Answer 1

Step-by-step explanation:

Find the area of the dining table whose diameter is 105 cm.

Solution:

Diameter of the dinig table (d) = 105 cm

∴ Radius r = \(\frac { d }{ 2 } \) = \(\frac { 105 }{ 2 } \) cm

Area of the circle = π r2 = \(\frac { 22 }{ 7 } \) × \(\frac { 105 }{ 2 } \) × \(\frac { 105 }{ 2 } \) = 8662.5 sq.cm

Area of the dinning table = 8662.5 cm2

Answer 2

Answer:

Areaofringisgivenas π(R2−r2)

=22/7×(196−49)

=22×21=462

areaofringsectoris x/360×areaofring

⟹40/360×462=51.33cm tq