H Holly May New member Joined Sep 8, 2016 Messages 1 Sep 8, 2016 #1 a girl 160 cm tall, stands 360 cm from a lamp post at night. Her shadow from the light is 90 cm long. How high is the lamp post?
a girl 160 cm tall, stands 360 cm from a lamp post at night. Her shadow from the light is 90 cm long. How high is the lamp post?
D Deleted member 4993 Guest Sep 8, 2016 #2 Holly May said: a girl 160 cm tall, stands 360 cm from a lamp post at night. Her shadow from the light is 90 cm long. How high is the lamp post? Click to expand... First draw a sketch of the situation. You should see several similar triangles - whose sides will be proportional. If the height of the lamp-post is 'L', then L/(360+90) = 160/90 Then continue.... Last edited by a moderator: Sep 8, 2016
Holly May said: a girl 160 cm tall, stands 360 cm from a lamp post at night. Her shadow from the light is 90 cm long. How high is the lamp post? Click to expand... First draw a sketch of the situation. You should see several similar triangles - whose sides will be proportional. If the height of the lamp-post is 'L', then L/(360+90) = 160/90 Then continue....
