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2015-12-04T15:42:44+05:30

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(2a -10)+(a - 11)= 90           (sum of complementary angles= 90)
2a - 10 + a - 11=90
3a -21= 90
3a= 90+21
3a =111
a= 111/3
a = 37
2 5 2
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2015-12-04T15:43:18+05:30

This Is a Certified Answer

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Sum of complementary angles is 90 degree
therefore,
(2a-10)+(a-11)=90
(bring like terms together)
(2a+a)-(10+11)=90
3a-21=90
3a=90+21=111
a=111÷3
a=37
2 5 2