The points A(0, 0), B(0, 4a - 4) and C(2a + 1, 2a + 6) form a triangle. If angle ABC = 90, what is the area of triangle ABC? Choose the correct option:
A) 88
B) 98
C) 108
D) 78
E) 90
1/2bh=1/2(2a+1)(2a+6)   Now 4a-4=2a+6   2a=10 , a=5   Therefore,   88(0,0); B(0,16); C(11,16)   1/2*11*16= 
<gadget id="calculator">1/2*11*16</gadget>
<output>88</output>
88   88nswer: 88
<result>A</result>
The points A(0, 0), B(0, 4a - 4) and C(2a + 1, 2a + 6) form a triangle. If angle ABC = 90, what is the area of triangle ABC?