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3 years ago

Work out angle a with the sine rule please help will give u brainlest

Mathematics

2 answers:

aliya0001 [1]3 years ago

6 0

Answer:

93 degrees

Step-by-step explanation:

Because there is no length opposite A we must work out angle C first to then work out angle A using the sine rule.

SinA/a = SinB/b

Sina/11 = Sin38/9

multiply both sides by 11

sina = 11sin38/9

press shift on your calculator because we are finding an angle

sin-1 = (11sin38/9)

MAKE SURE YOU CLOSE ALL THE BRACKETS

this should give you 48.8

38+48.8 = 86.8

all angles in a triangle add up to 180 therefore

180-86.8 = 93.2

rounds to 93 degrees , this is angle A

Alisiya [41]3 years ago

5 0

48.8052 or 131.195 ° degrees is the answer for angle A

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xeze [42]

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