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Both base angles of an Isosceles triangle are by definition the same and, as the internal angles of a triangle must ad up to 180 degrees (again by definition), the the 3rd angle must = 180 - 2 times Y,

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Q: What is the measure of the vertex angle of an isosceles triangle if one of the base angles measures Y degrees?
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Related questions

What is the measure of the base angle of an isosceles triangle if the vertex measures 38 degrees?

(180 - 38)/2 = 71 degrees (base angles of an isosceles triangle are congruent).


If the measures of two angles of an isosceles triangle are 54 degrees and 63 degrees what is the measure of the third angle?

63 degrees


What is the measure of a base angle of an isosceles triangle if its vertex angle measures 65?

57.5 degrees


What is the measure of the vertex angle of an isosceles triangle if one of the base angles measures 48?

84 degrees


What is the measure of the vertex angle of an isosceles triangle if one of its base angles measures 48?

84 degrees


What is the measurement of the vertex angle of an isosceles triangle is the measure of one of its base angle is 42?

The vertex angle of an isosceles triangle is equal to the measure of each of its base angles. Therefore, if one of the base angles measures 42 degrees, then the vertex angle also measures 42 degrees.


An exterior angle at the base of an isosceles triangle measures 130 find the measure of the vertex angle?

80 degrees.


What is the measure of the vertex angle of an isosceles triangle if one of its base angles measures 53?

If your "53" is in degrees, then the vertex angle is 74 degrees.


One angle of an isosceles triangle measure 100 degree what are the measures of the other two angles?

40 degrees each


What is the measure of the base angles of an isosceles triangle whose vertex angle has a measure of 50 degrees?

130 degrees is the measure of the base angles of an isosceles triangle whose vertex has a measure of 50 degrees.


What is the measure of a base angle of an isosceles triangle if its vertex angle measures 50?

Its 2 equal base angles will each measure 65 degrees


What are the measures of the Base angles of an isosceles triangle whose vertex angle has measure of 55?

Each base angle is 62.5 degrees