Area = πr² = ⁹⁄_π. ∴ r = ³⁄_π

Circumference = 2πr = 6ft.

∴ No. of rev. = \(\frac{120}{6}\) = 20

Col. A ⇒ 1 + 17 = 18

Col. B ⇒ 1 × 19 = 19

Total of all angles is 18x.

∴ x = 100

∴ Angles are 100⁰ ,30⁰ ,50⁰

∴ c² must be greater than a² + b²

(Rule: In a right angle Δc²= a² + b²

But if angle c is greater than angle a + angle b, then c² > a² + b²)

Area of ground 8 × 5 = 40 sq meters. Area of ground with pavements around the ground

10 × 7 = 70 sq. meters.

∴ Area of pavement = 30 sq. meters.

αβ = 1225

Min. value of β = 1 and Max. value of α = 1225

∴ Col. A = 1225 -1 = 1224

\(\left ( \frac{1}{7} \right )^{\theta }\frac{1}{\sqrt{19}}=7\times \frac{1}{7}-19\times \frac{1}{19}=0\)

To reduce the alcohol to 10%, quantity of water should be doubled.

∴ Addition will be 270 m!.

Since we have to buy 5 cent stamps, value of 7 cent stamps must be a multiple of 5.

∴ John can buy 5 stamps of 7 cents and 8 stamps of 5 cents or 10 stamps of 7 cents and 1 stamp of 5 cents.

∴ 5 cent stamps can be either 8 or l.

10 more people can clean 30 more tanks in the same time i.e. 3 minutes,

∴ 5 people must be cleaning 15 tanks in 3 minutes..

BD = 4, DC = 12 ∴ BC = 16

∴ Perimeter = 35