Mathematics
Grade9
Easy

Question

The measure of angle A _________.

  1. 15°
  2. 21°
  3. 32°
  4. 25°

The correct answer is: 25°


    w e space k n o w space t h e space s u m space o f space i n t e r i o r space a n g l e s space o f space a space t r i a n g l e space equals space 180 to the power of o
s o space space A space plus space B space plus space C space equals space 180 to the power of O
G I V E N space B space equals space 97 to the power of o space A N D space space C space equals 58 to the power of o
s o space space A space plus space space 97 to the power of o space plus space 58 to the power of o space equals space 180 to the power of o
space A space equals space 180 to the power of o space minus space left parenthesis space 97 to the power of o plus 58 to the power of o right parenthesis
A space equals space 180 to the power of o minus 155 to the power of o
A space equals space 25 to the power of o space a n s w e r
    so option 4 is the correct answer

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