Sector problem please help

The answer is (π/4)*r

Step-by-step explanation:

Formula length of arc when the angle given is in radian as the case given

s = r*θ

s=arc length (in radians)

r=radius

θ=central angle in radians

But when the angle given is in degrees the length is expressed as

s= 2πr*(θ/360)

the surface area is 124cm²

step-by-step explanation:

length: 4cm

width: 9cm

height:   2cm

first, you divide the triangle in two, tô form a retangle triangle. after, using pythagoream theorem:

18^2 = 14^2 + (x/2)^2

(x^2/4) + 196 = 324

x^2/4 = 324 - 196

x^2/4 = 128

x^2 = 512

x = √512

x = √2^9

x = 16√2 cm

i hope i you.