Q1
What is sine (sin) in a right triangle?
AOpposite/hypotenuse
BAdjacent/hypotenuse
COpposite/adjacent
DHypotenuse/opposite
SSCClass 9 (SSC)Mathematics - Geometry (भूमिती)Ch 8 · Topic 1
Trigonometry
Trigonometry studies relationships between angles and sides of triangles, particularly right triangles, using ratios like sine, cosine, and
Core concept
In a right triangle, sine (sin) is the ratio of the opposite side to the hypotenuse, relative to a given angle.
How it works
Cosine (cos) is the ratio of the adjacent side to the hypotenuse, while tangent (tan) is the ratio of opposite to adjacent sides.
Why it matters
These trigonometric ratios remain constant for a given angle, regardless of the triangle's size, making them powerful tools for calculations.
Key detail
Trigonometry has practical applications in fields like architecture, navigation, and physics, especially for calculating heights and distances.
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Quick notes
• Sine (sin) = opposite/hypotenuse.
• Cosine (cos) = adjacent/hypotenuse.
• Tangent (tan) = opposite/adjacent.
• These ratios are for right triangle angles.
• Ratios constant for a given angle.
• Independent of triangle size.
• Applications: architecture, navigation, physics.
• Used for calculating heights, distances.