vertices A(0,7), B(5,-5) and C(10,7). The area of △ABC is A.50 B.60 C.80 D.120 E.140 30.△ABC is an isosceles right triangle with ∠B=90°. If A(3,-2),B(2,-1), then AC=… A. 2 B.1 C.2 D.3 E.4 What is the perimeter

of a quadrilateral are in the ratio 1 : 2 : 3 : 4, then the degree measure of the largest angle is A.36° B.45° C.90° D.108° E.144° If k.1800 is divided into three amounts in the ratio 4:5:6. The largest

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