Question
A 18 m long ladder (whose foot is on the ground) leans
against a wall making an angle of 60° with the wall. What is the height (in m) of the point where the ladder touches the wall from the ground?Solution
In ΔABC ∠C = 180∘ − 30∘ − 90∘ ∠C = 60° Now, sin 60∘ = AB/AC √3/2 = AB/18 ⇒ AB = 9√3
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The ratio of zinc and copper in a brass pieces is 2:5. How much zinc will be there in 140 kg of such a piece?
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1 – [(5 – {2 + (–5 + 6 – 2)2}] , बराबर है -
- The product of two numbers is 15.75. If one of the numbers is 4.5, then find the other number.
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