Question
What is the main constituent of
biogas?Solution
Methane (CH4) is the main constituent of biogas, typically making up about 50-75% of the gas produced during the anaerobic digestion of organic matter.
Each interior angle of a regular polygon is 140°. Then find out how many diagonals are there?
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If b sin θ = a, then sec θ + tan θ = ?

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(i) volume,
(ii) total surface area.