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Sophie [7]
3 years ago
7

Dose someone know please

Mathematics
2 answers:
Tasya [4]3 years ago
5 0
The sum of all the angles in this line equals 180
a+90+21=180
a+111=180
a=69
grandymaker [24]3 years ago
3 0

Answer:

i think its like:

see that middle angle there, thats a 90° angle and straight linea measure 180°. so add 90 + 21 and subtract from 180

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