angel0203wilcox
25.06.2019 •
Mathematics
Ineed on number 8 i really need this done.
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Ответ:
28%
Step-by-step explanation:
25 is 1/4 of 100, so it would be 7*4 which is 28
Ответ:
28%
Step-by-step explanation:
Ответ:
It has to do with supplementary angles.
Supplementary angles add up to 180o
A triangle has angles that always add up to 180o
Equations
First condition
<A + <CBD = 180o
<CBD + <C + <D = 180o
Since both left sides = 180o
The two left sides can be equated
<A + <CBD = <CBD + <C + <D Subtract <CBD from both sides.
<A = <C + <D which is what you needed to prove.
Angle sizes.
<A = <C + <D
<C = 65
<D = 55
<A = 65 + 55
<A = 120o <<<< 1st answer.
<B = 180 - 120
<B = 60o <<<<< 2nd answer.