Question

find the area of a quadrant of a circle whose circumference is 22cm.​

Answer 1

Answer:

Using the formulas

A=πr2

C=2πr

Solving forA

A=C²/4π=22²/4·π

≈38.5155

where are you from

Answer 2

Answer:

Let speed of fast train be x km/hr

speed of slower train = x - 10 km/hr

Given fast train takes 1 hr less than slower one in covering 200 km

⇒ 200/ x = 200/x-10 - 1

⇒ 200/x = 200 - (x-10) / x-10

⇒ 200(x-10) = 200x - x (x-10)

⇒200x-2000 = 200x - x² + 10x

⇒x² - 10x - 2000 = 0

⇒ x² -50x + 40x -2000 = 0 ⇒ (x-50)(x+40) = 0

x = 50 and x= - 40