Question

1.If the point A (x, 2), B (-3, 4) and C (7,-5) are collinear, then the va
(b) 63
(c) 60
(d) - 60
2.If two solid hemispheres of same base radius rare ;
surface area of this new solid?
3. The perimeter of a triangle with vertices (0,4), (0,0) and (3,0) is :
(b) 69172
(b) 12
(c) 11
(d) 7+V5​

Answer 1

Answer:

1. Slope of AB = slope of BC

\frac{ - 4 - 2}{ - 3 - x} = \frac{ - 5 + 4}{7 + 3 } \\ \frac{ - 6 }{ - 3 - x} = \frac{ - 1}{10} \\ - 6 \times 10 = - 1 \times ( - 3 - x) \\ - 60 = + 3+x \\ -60-3 = x \\ x = -63

x=-63

2.4πr^2

2πr^2+2πr^2=4πr^2

3.(b)12

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