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Angelina_Jolie [31]
3 years ago
10

The sides of an isosceles triangle have lengths of 10, 10, and 4. Find the measures of the base angles.

Mathematics
1 answer:
kotegsom [21]3 years ago
3 0

Answer:

The base angles measure 78.46 degrees to the nearest hundredth.

Step-by-step explanation:

Applying the Cosine Rule:

10^2 = 10^2 + 4^2 - 2.4.10cosX     where X is a base angle.

cos X = (100 - 100 - 16)/ (-80)

cos X = -16/-80

cos X = 0.2

X = 78.463 degrees

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