When the sun is at an elevation of `35^circ`, the shadow of a tree is 10 metres. What would be the length of the shadow, when the sun is at an elevation of `25^circ` ?

When the sun is at an elevation of 40^circ the length of the shadow of a tree is 18 metres. What is the height of the tree?

When the sun is at an elevation of 40^circ the shadow of the flagpost is 15 metres. a) Find the height of the flagpost. b) What would be the length of, the shadow, when the sun is at an elevation of 45^circ ? [tan 40=0.84 , sin 40=0.64]

One sees the top of a tree on the bank of a river at an elevation of 70^circ from the other bank. Stepping 20 metres back, he sees the top. of the tree at an elevation of 55^circ . Height of the person is '1.4' metres. a) Draw a rough figure and mark the measurements. b) Find the height of the tree. c) Find the width of the river. '[tan 70=2.75 , tan 55=1.43]'

A '1.5' metre tall boy saw the top. of a building under construction at an elevation of 30^circ .The completed building was 10 metres higher and the boy sáw its top at an elevation of 60^circ from the same spot. What is the height of the büilding?

A boy saw the top of a building under construction at an elevation of 30^circ . The completed building was 12m higher and the boy saw its top, at an elevation of 60^circ from the same spot. a) Draw a rough figure based on the given details. b) What is the height of the building? c) What is the distance between the building and the boy?

When each side of a square was reduced by 2 mețres, the area became. 49 square metres. What was the length of a side of the original square?

A child stands 30 metres away from the foot of a telephone tower, sees the top of the tower at an angle of elevation 30^circ . Stepping some distance towards the tower, sees it at an elevation of 45^circ a) What is the height of the tower? b) How much distance did he walk?

Two buildings in a plane ground are 20 metres apart. From the top of the smaller building, one sees the base of the building at a depression of 50^circ and its top at an elevation of 25^circ . a) Draw a rough figure and mark the measurements. b) Find the helght of the smaller building. c) Find the height of the bigger building. '[tan 50^circ=1.2, tan 25^circ=0.4]'

Two children of same height standing on either sides of a tower, looks the top of tower at an elevation of 40^circ , 55^circ . The distance between the children is 25 metres. Height of the chlidren is 1.5 metres. a) Draw a rough figure showing the givën measurements. b) Calculate the height of the tower. [sin 40^circ =0.64, sin 55^circ =0.82, cos 40^circ =0.77, cos 55^circ =0 .57, tan 40^circ =0.89, tan 55^circ =1.43]