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MArishka [77]
3 years ago
12

How many digreee are there in a right angle

Mathematics
2 answers:
Artyom0805 [142]3 years ago
7 0

Answer:

90

Step-by-step explanation:

Nina [5.8K]3 years ago
4 0

Answer:

90 degrees

Step-by-step explanation:

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Answer:

b=9,a=12

Step-by-step explanation:

I solved by substitution:

b = 3/4a  ---> plug this into the other equation

a + b = 21   is now    a + 3/4a = 21

Reduce: 7/4a = 21

a = 12

Now solve for b:

b=3/4a is now b=3/4(12)

b=9

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