The sum of the measures of two angles of a triangle is twice the measure of the third angle. The measure of the second angle is 9^∘ more than the measure of the third angle. Find the measures of the three angles. A)The first angle is 60^∘ , the second angle is 51^∘ , and the third angle is 69^∘ . B)The first angle is 69^∘, the second angle is 60^∘ , and the third angle is 51^∘. C)The first angle is 51^∘ , the second angle is 60^∘ , and the third angle is $69 ^ { \circ }$ . D)The first angle is $510$ , the second angle is $69 ^ { \circ }$ , and the third angle is $60 ^ { \circ }$ . E)The first angle is $69 ^ { \circ }$ , the second angle is $510$ , and the third angle is $60 ^ { \circ }$ .

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The Answer of The sum of the measures of two angles of a triangle is twice the measure of the third angle. The measure of the second angle is 9^∘ more than the measure of the third angle. Find the measures of the three angles. A)The first angle is 60^∘ , the second angle is 51^∘ , and the third angle is 69^∘ . B)The first angle is 69^∘, the second angle is 60^∘ , and the third angle is 51^∘. C)The first angle is 51^∘ , the second angle is 60^∘ , and the third angle is $69 ^ { \circ }$ . D)The first angle is $510$ , the second angle is $69 ^ { \circ }$ , and the third angle is $60 ^ { \circ }$ . E)The first angle is $69 ^ { \circ }$ , the second angle is $510$ , and the third angle is $60 ^ { \circ }$ .

The Sum of the Measures of Two Angles of a Triangle