Mechanics problem: Ladder on a wall help please

[learning420]

Mechanics problem: Ladder on a wall help please :(

Homework Statement

"A ladder of weight 200n and of length 5m rests with its lower end on a horizontal rough concrete surface and its upper end against a smooth wall. if the ladder just starts to slip when the angle between it and the concrete is 40(degrees) calculate the coefficient of static friction:"

having trouble with trigonometry here, i can do questions where i have lengths but no angle but this one is spinning me out.

 

[tiny-tim]

Welcome to PF!

Hi learning420! Welcome to PF!

Draw a diagram showing the normal force form the ground, the friction force, the weight, and the direction of the force from the wall, and take components and moments …

what do you get? ​