What is the area of def shown in the figure?

The area of triangle DEF is

Step-by-step explanation:

we know that

The area of a triangle is equal to

where

b is the base of triangle

h is the height of triangle

In this problem

In the triangle DEF we have

substitute the values in the formula

answer: 75°

step-by-step explanation:

∠esk is the supplement of ∠edk, so is 100°. ∠esd = 1/2·arc ed, so is 25°.

since ∠esk = ∠esd + ∠dsk

you have 100° = 25° + ∠dsk . .

fill in known values 75° = ∠dsk . . . . .

subtract 25°

step-by-step explanation: