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Mathematics — AI-generated practice question

AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.

Q1. [1] straightforward initial-understanding
In a right triangle ABC, right-angled at B, how is sin A defined in terms of its sides?
Generated by claude-sonnet-4-6 · 2026-06-15 10:21 · grounding rag
Model Answer

In a right triangle ABC, right-angled at B:

$$\sin A = \frac{\text{side opposite to angle A}}{\text{hypotenuse}} = \frac{BC}{AC}$$

Source: Chapter 8, Section 8.2 Trigonometric Ratios

Explanation

The examiner expects the definition in words and the fraction with correct sides. BC is opposite to ∠A and AC is the hypotenuse. Do not confuse AB (adjacent side) with BC (opposite side). Writing only the formula without the word definition may lose half the mark.

Previous-year CBSE Grade 10 board exam questions, organised by subject and chapter, each with a model answer — free to read and print.