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- The application problems related to angle in seventh grade mathematics (1)
The application problems related to angle in seventh grade mathematics (1)
Solution: Let this angle be x, then its complementary angle is (90-x) and its complementary angle is (180-x).
2/9( 180-x)+ 1=90-x
40-2x/9+ 1=90-x
X-2x/9=50- 1
7x/9=49
x=63
A: This angle is 63 degrees.
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