answer only 21 and 24 and solve this question please
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use let it is an abc triangle
ab = bc = ca
use formula
1/2 underoot x1 ( y2 -y3) + x2 (y3-y1) + x3(,y2 - y1)
if their answers are same or they satisfies then tri. is equilateral
24.
use,
sum of zeroes = -b/a
a-b+a+b = 6 / 2
2a = 3
a = 3/2
ab = bc = ca
use formula
1/2 underoot x1 ( y2 -y3) + x2 (y3-y1) + x3(,y2 - y1)
if their answers are same or they satisfies then tri. is equilateral
24.
use,
sum of zeroes = -b/a
a-b+a+b = 6 / 2
2a = 3
a = 3/2
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