Question: The length of two sides of a triangle are 9.3cm and 10.5cm and the included angle is 71°. Calculate:
a) the area of the triangle
b) the perimeter of the triangle
My answer:
a) Area=46.2cm^2
b) Perimeter=33.5cm (correct to 1.decimal.place)
2. A surveying team marks off two positions P and Q. They are on level ground, on the same side of a hill and in line with the hill. The horizontal distance from P to Q is 1200m and the team measure the angle of elevation of the summit of a hill from P and Q as 21° and 71° respectively. Find the height of the hill.
My answer: Height of hill=822.1m (correct to 1. decimal place).
Are the answers for question 1. a and b and question 2 correct? I have spent many hours on all of these questions. Could you please tell me if they are wrong?
Also I live in Australia...if you are not familiar with centrimetres(cm) and metres (m) here are a few conversions:
1cm=0.01metre
10cm=0.1metre (m)
100cm=1metre
1000metres=1kilometre (km
2007-03-25
16:09:25
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4 answers
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asked by
Anonymous
in
Science & Mathematics
➔ Physics