Can I get math help please?
An isosceles trapezoid has base angles of 45° and bases of lengths 9 and 15. The area of the trapezoid is
36 sq. units
67.5 sq. units
72 sq. units
Can you help me with this? Which one of the three answers provided is it?
- Ed ILv 71 decade agoFavourite answer
A = (1/2)h(b1 + b2) = (1/2)(3)(15 + 9) = 36
The first answer is the correct choice.
- SammiChengHKLv 51 decade ago
½ x a x (b1 + b2)
= ½ x ((15 - 9) ÷ 2 x tan45º) x (9 + 15)
= ½ x (6 ÷ 2 x 1) x 24
= ½ x 3 x 24
- Anonymous1 decade ago
We can't tell because the formula for a trapezoid's area is:
Area = a*(b1+b2)/2
where b1 = the length of one base
b2 = the other base's length
and a = altitude (the distance between the bases)
The altitude is not provided in the question, but if you give us a measure of one of the trapezoid's legs we can use the Pythagorean Theorem to find the altitude.
- maniramLv 44 years ago
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