Download How to . . .

Trigonometry - finding angles
Now have a go yourself . . . Work out the side of angle x
How to . . .
x
18 cm
11 cm
13 cm
9 cm
x
x
*The diagram shows a ladder leaning against a vertical wall.
The ladder stands on horizontal ground.
5 cm
15.8 cm
The length of the ladder is 6 m. The bottom of the ladder is
2.25 m from the bottom of the wall.
17 cm
x
A ladder is safe to use when the angle marked y is about
14 cm
75o. Is the ladder safe? You must show all your working.
14 cm
x
x
13.8 cm
20 cm
18.3 cm
6.2 cm
(3)
x
NOT DRAWN TO SCALE
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9.7 cm
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Ready to be marked ?
Exam Questions
(a) Here is a right angled triangle. Calculate the
size of the angle marked x, giving your answer correct to 1 decimal place.
Checklist
Correct ratio used (sin/cos/tan)
Working out shown
Keywords
8 cm
x
5 cm
Things to remember ...
(b) Here is another right angled triangle. Calculate
the value of y. Give your answer correct to 1 decimal place
What went well ...
y cm
o
40
Teacher comment ..
12.5 cm
(4)