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Use the fact that the sum of the 3 angles in a triangle is 180° to answer this question.One angle in a triangle has a measure that is three times as large as the smallest angle. Themeasure of the third angle is 20° more than that of the smallest angle. Find the measure of the eachof the angles.nsOThe SMALLEST angle has a measure of

User Tatsuya Kanemoto
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1 Answer

22 votes
22 votes

Let us call the angles x, y , and z. We know that these three angles must add up to 180; therefore,


x+y+z=180

If x is the smallest angle, we know that one of the angles (call it y) is 3 times this angle; therefore,


y=3x

And the other angle z is 20 more than the smallest angle x; therefore, we have


z=20+x

Putting the last two equations into the very first equation gives us


x+3x+20+x=180
5x+20=180
\textcolor{#FF7968}{\therefore x=32}

which is the measure of the smallest angle.

The other two angles are


y=3x=3(32)
\textcolor{#FF7968}{y=96}

and


z=20+x=20+32
\textcolor{#FF7968}{z=52.}

Hence, the measure of the smallest angle is 32,

The measure of the middle angle is 52

And the measure of the largest angle is 96.

User Don F
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