Answer:
Step-by-step explanation:
we know that
The measure of central angle ABC is 
radians
so
subtends the complete circle
The area of the shaded sector is the area of a quarter circle
so
The area of a quarter circle is equal to
we have
substitute
Answer:
85°
Step-by-step explanation:
The triangle pictured is an isosceles triangle because side KJ = LJ.
this means that ∠JKL = ∠JLK = x°
Also recall that all interior angles of a triangle add up to 180°
Hence,
180° = ∠JKL + ∠JLK + ∠KJL
180 = x + x + 10
180 = 2x + 10 (subtract 10 from both sides and rearrange)
2x = 180 - 10
2x = 170 (divide both sides by 2)
x = 170 / 2 = 85°
depends....
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