gwd24-31 求迅速解法

Kath1985 · 发表于 2011-3-17 21:14:03

Each side of a certain parallelogram has length 6. if the area of the parallelogram is 18. which of the following is the measure of one of its angles?

A. 30’ B. 45’ C. 60’ D. 90’ E.120’

是A

請問: 如果不用sin 、cos的角度公式，有沒有其他求法?

Kath1985 · 发表于 2011-3-19 19:44:59

有請好心人士

sdcar2010 · 发表于 2011-3-19 20:39:20

area = 18 = length * height = 6 * 3. Therefore, the height is 3, half of the long edge of 6. If an angle's sine = 0.5, that angle equals 30 degree.

Kath1985 · 发表于 2011-5-7 20:17:03

請求不用cos sin的解法ing please

七百年后 · 发表于 2011-5-7 20:21:03

从A开始试

Kath1985 · 发表于 2011-5-8 21:20:40

可不可以說明要怎樣從A開始試?
題目中的"which of the following is the measure of one of its angle" 是指任何一角可能的度數嗎 ? 這句和答案有沒有關聯?

sdcar2010 · 发表于 2011-5-8 21:43:58

C and E can be removed because 60+120 = 180 and if 60 is a possible angle, then 120 is also a possible angle.

D can be removed because that would make the area as big as 36.

That leaves A and B. Calculate the areas of each.

gwd24-31 求迅速解法

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