Last seen: Jun 14, 2021
Given, the perpendicular from A on side BC of a Δ ABC intersects BC at D such that; DB = 3CD. In Δ ABC, AD ⊥BC and BD = 3CD In right angle tri...
20q.png By Pythagoras theorem in ΔACE, we get AC2 + CE2 = AE2 …………….(i) In ΔBCD, by Pythagoras theorem, we get BC2 + CD2 = BD2 ………………..(ii) ...
20q.png Let AB and CD be the poles of height 6m and 11m. Therefore, CP = 11 – 6 = 5m From the figure, it can be observed that AP = 12m By Py...
Speed of first aeroplane = 1000 km/hr Distance covered by first aeroplane flying due north in hours (OA) = 100 × 3/2 km = 1500 km Speed of second...
20q.png Let AB be the pole and AC be the wire. By Pythagoras theorem, AC2 = AB2 + BC2 242 = 182 + BC2 BC2 = 576 – 324 BC2 = 252 BC = 6...
20q.png Let BA be the wall and AC be the ladder, Therefore, by Pythagoras theorem, AC2 = AB2 + BC2 102 = 82 + BC2 BC2 = 100 – 64 BC2 = 3...
(a) plains and river valleys
(i) - (c) (ii) - (d) (iii) - (a) (iv) - (b)
(c) dispose poly packs after shopping
(c) terrace cultivation
Three ways to conserve water are as under: Rainwater harvesting: It is a method of collecting water while it rains so that it may come of use in t...
Steps taken by the government include establishment of natural parks and wildlife sanctuaries in different parts of India. Their purpose is conservati...
Land is an important resource because it provides surface for agriculture, living, forestry, industries, construction, etc. Most activities take place...
Reasons for land degradation are: Ever-growing demand of the growing population. Destruction of forest cover.
Temperature and rainfall are two main climatic factors responsible for soil formation. Rainfall contributes in breaking the rocks by applying pressure...
To conserve natural resources we have to: Ensure that our natural resources are preserved. Ensure that we do not destroy our ecosystem. Renew re...