The Total solution for NCERT class 6-12
It is a well known fact that during a total solar eclipse the diskof the moon almost completely covers the disk of the Sun. From this fact andfrom the information you can gather from examples 2.3 and 2.4, determine theapproximate diameter of the moon.
The position of the Sun, Moon, and Earth during a lunar eclipse isshown in the given figure.
Distance of the Moon from the Earth = 3.84 × 108 m
Distance of the Sun from the Earth = 1.496 × 1011 m
Diameter of the Sun = 1.39 × 109 m
It can be observed that ΔTRS and ΔTPQ are similar. Hence, it canbe written as:
Hence, the diameter of the Moon is 3.57× 106 m.