Step 1: Understanding Exterior Angles.
The sum of the exterior angles of any polygon, including a triangle, is always 360°. Since each right angle is 90°, the sum of the exterior angles of a triangle equals four right angles (4 × 90°).
Step 2: Verifying the Options.
- Option (1): Three right angles is incorrect.
- Option (2): Four right angles is correct, as the sum of the exterior angles of a triangle is always 360°.
- Option (3): Five right angles is incorrect.
- Option (4): Six right angles is incorrect.
Conclusion:
Therefore, the correct answer is (2) Four right angles.
Find the number of triangles in the given figure.
Find the unknown frequency if 24 is the median of the following frequency distribution:
\[\begin{array}{|c|c|c|c|c|c|} \hline \text{Class-interval} & 0-10 & 10-20 & 20-30 & 30-40 & 40-50 \\ \hline \text{Frequency} & 5 & 25 & 25 & \text{$p$} & 7 \\ \hline \end{array}\]
Two concentric circles are of radii $8\ \text{cm}$ and $5\ \text{cm}$. Find the length of the chord of the larger circle which touches (is tangent to) the smaller circle.