UC知道math(geometry) problems
来源：百度知道 编辑：UC知道 时间：2024/09/24 02:24:46
1)What is the altitude of an isosceles triangel with base 10 and congruent sides of length 9?
2)Jenny went for a mountain-bike ride in a relatively flat wooded area. She rode for 7 km in one direction, then turned and peddled 24 km in another. Finally she turned and rode 25 km in yet another direction. Stopping, Jenny took out a map and drew her path. Could Jenny be back at her starting point?(why) Could the path be a right triangle?(why)
3)what is the length of the diagonal of a square with side lengths 7方根2？
4)to find the height of a tower, a surveyor positions a transit that is 2 m tall at a spot 75 m fron the base of the tower. She measures the angle of elevation to the top of the tower to be 32°. what is the height of the tower, to the nearest meter?
plz give explaination of each problems... thank you very much~~!!
high school 9 grade,
2)Jenny went for a mountain-bike ride in a relatively flat wooded area. She rode for 7 km in one direction, then turned and peddled 24 km in another. Finally she turned and rode 25 km in yet another direction. Stopping, Jenny took out a map and drew her path. Could Jenny be back at her starting point?(why) Could the path be a right triangle?(why)
3)what is the length of the diagonal of a square with side lengths 7方根2？
4)to find the height of a tower, a surveyor positions a transit that is 2 m tall at a spot 75 m fron the base of the tower. She measures the angle of elevation to the top of the tower to be 32°. what is the height of the tower, to the nearest meter?
plz give explaination of each problems... thank you very much~~!!
high school 9 grade,
1）refer to the picture
2) since 7*7+24*24=49+576=625=25*25 ，these 3 segments can make up a
right triangle and Jenny could be back.
3）refer to the picture-2
4）refer to the picture-3
HIGH SCHOOL几年级啊？本想帮你做的 今天太累了