Need help with suckey math.?

Does these numbers make either a right triangle, obtuse triangle or acute.

15,8,21

4,5,6

.03, .04, .06

(radicand)3, 2, 3

20,21, 28

30, 40, 50

I would do them myself but I don’t get how.

Please help?

Top 1 Answers

A few days ago

Anonymous

Favorite Answer

Let a be the longest side of the triangle, and b, c be the other two sides.

Work out s = b^2 + c^2 – a^2

If s = 0, the triangle is right-angled.

If s > 0, the triangle is acute.

If s < 0, the triangle is obtuse. This is derived from the cosine rule: a^2 = b^2 + c^2 - 2bc cos(A) where A is the angle opposite side a. Rearranging: cos(A) = (b^2 + c^2 - a^2) / 2bc. b and c are positive, and therefore the sign of b^2 + c^2 - a^2 gives the sign of cos(A). Angles over 90deg in a triangle have cos(A) < 0, angles under 90deg have cos(A) > 0, and for a right angle

cos(A) = 0.

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Need help with suckey math.?

Need help with suckey math.?

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