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URGENT PLEASE HELP WITH EXPLANATION

URGENT PLEASE HELP WITH EXPLANATION-example-1

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These sorts of questions you have to use something called trigonometry. Therefore you cannot just half 90 degrees or something.

Remember these trigonometric functions:
sinθ= opposite/hypotenuse
cosθ= adjacent/hypotenuse
tanθ= opposite/adjacent

Question 1:

7cm is the opposite side, as it’s opposite angle θ
9cm is the adjacent side, as it’s next to angle θ

The trigonometric function that involves the opposite and adjacent side is tan.

tanθ= opposite/adjacent
tanθ= (7/9)
θ= tan^-1 (7/9)

Put tan^-1(7/9) into your calculator, and you should get 37.9 degrees to one decimal place.

θ= 37.9 degrees (to one decimal place)


Question 2:

30cm is the opposite side, as it’s opposite angle 35 degrees.
y is the adjacent side, as it’s next to the angle 35 degrees.

So you use the tan function again.

tanθ= opposite/adjacent
tan35= (30/y)
y(tan35)=30
y= 30/tan35

put 30/tan35 into your calculator, and you should get 42.8 to one decimal place.

y= 42.8cm (to one decimal place)


(i’m really sorry if i’m wrong/made any calculation errors, but i’m sure this is the approach you have to use when answering these questions)
User Gozup
by
8.4k points
2 votes

Answer:

a)180-90=90

90÷2=45

answer=45

b)32.

Previous question 9-7=2cm

Now. 30+2=32cm

User Shikha Dhawan
by
7.9k points

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