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The adjoining figure shows the cross-section of a railway tunnel.
The radius of the tunnel is 3.5m (i.e., OA=3.5m) and ∠AOB=90o. Calculate :
i. the height of the tunnel.
ii. the perimeter of its cross section, including base.
iii. the area of the cross-section
iv. the internal surface area of the tunnel, excluding base, if its length is 50m.
(Ans: (i) 5.97m (ii) 21.44m (iii) 28.875 sq m (iv) 825 sq m)
Find the middle term of the AP 1, 8, 15....505. A ns: Middle terms a + (n-1)d = 505 a + (n-1)7 = 505 n - 1 = 504/7 n = 73 ∴ 37th term is middle term a 37
how do you divide
Beals Conjecture
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Solve the form x 2 + bx - c ? This tutorial will help you factor quadratics that look something like this: x 2 + 11x - 12 (No lead coefficient; positive middle coeffic
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