Isosceles 65784

An isosceles triangle has an angle of 78°20' at the base. Calculate the size of the angle between the arms.

Correct answer:

γ =  23.3333 °

Step-by-step explanation:

α=78°20=78°+6020°=78.3333°78.3333 β=α=78.3333=323578.3333   α+β+γ=180    γ=1802 α=1802 78.3333=23.3333=23°20

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