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Harman [31]
3 years ago
7

Please bootiful people help this nonsmart person

Mathematics
1 answer:
vlada-n [284]3 years ago
4 0

Answer:

9

Step-by-step explanation:

the triangle is right angle.

at right angle it makes 90°. therefore;

(3d+1)°+(6d+8)°=90°

3d+1°+6d+8°=90°

9d+9°=90°.

9d=90°-9°

9d=81°

d=81/9

d=9°

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