1) The base angle of an isosceles triangle is 55 degree. The size of the vertical angle is

(a) 55 degree (b) 35 degree (c) 70 degree (d) 125 degree

Can anyone please give an explanation for this answer and what is vertical angle....

2) A ladder 25m long reaches a window of a building 20m above the ground.Detemine the distance of the foot of the ladder from the building.

so each base angle = 55

^{0}

sum of both base angles = 55

^{0 }+ 55

^{0 }= 110

^{0}

sum of 3 angles = sum of base angles + vertical angle

so, 180

^{0 }= 110

^{0 }+ vertical angle

so, vertical angle = 70

^{0 }

(2).

https://www.meritnation.com/ask-answer/question/a-ladder-25m-long-reaches-a-window-of-building-20m-abov/math/3851162

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