mth..

2007-09-01 3:08 am

If the area of △PQR is 21sq.units, and the coordinates of R are (4, k),find the two possible values of k P(-4,-3) Q(3,-3)

點做?..

回答 (1)

2007-09-01 8:18 pm

✔ 最佳答案

PQ=3-(-4)=7
Let h be its height
Hence,
7h/2=21
h=6

Therefore, the possible value of k is 6 and -6.

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