1) PQ || OR , Angle RPQ=35; the circumference covered by both Angle PO and QR is same.gig92 wrote:Hi, please find few questions in the file attached here. Each question is marked with a wrong and its answer. Could you please try to discuss/explain (how and whys) of these questions?
Each effort is highly appreciated.
to get length arc PQ = 1/2 Circumference (1) - 2(circum of PO OR QR) (2)
length of arc PO = (angle subtended at center/360) * (2*pie*r)
angle subtended at center = 2*Angle subtended at a point on circumference = 2 * 35.
length of arc PO = (35/360) (2*pie*9) = 7/2(pie)
value of (2) = 2*(7/2) * (pie) = 7*pie.
value of (1) = pie * r = pie * 9.
Answer = (1)-(2) = 9*pie-7*pie = 2*pie.
3) x^4+y^4 = 100
x will be greatest when y is least or 0.
put y=0.
x^4 = 100.
x^2=10
x= approx 3.1
