exam Maths Puzzle Numerical Ability

Please help me find the area of a triangle if:
a=2, b=1, and C=100 degrees.
The choices are as follows:
1. 0.98
2. 1.97
3. 0.17
4. 1.53
Thanks, Tami

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exam Other Question

(1)In how many ways can 2 letters be selected from set={a,b,c,d} when repitition of letters is allowed?
(a)if order of letters matters
(b)if order of letters doesn't matters

( r not equal to +/- 2, r^2-5r+6/r^2-4=