Help with trigonometry?

Question

Hi I have 2 maths questions that I have no idea how to do please help. 

The first one iswhat angle does a 3.8m ladder make with the ground, if it reaches 2.1m up the wall? 

The second one is A concreter uses a ramp to wheelbarrow in sand from the ground level to floor level inside a building under construction. Floor level is 75cm above ground level. if the ramp is 5.4 m long what angle, to the nearest degree, does the ramp make with the ground level?

Answer 1

(1)

From the above given information we can notice that the ladder is  leaned on a wall 

sin ø = opposite side length / hypotenuse length

sin ø = 2.1/3.8

sin ø = 0.5526

ø = arcsin (0.5526)

ø = 33.54

The Ladder making an angle ø = 33.54 with the wall .

Answer 2

(2)

Ramp is placed from ground level to floor level to wheelbarrow

Length of ramp is 5.4 m = 540 cm

sin ø = opposite side length / hypotenuse length

sin ø = 75/540

sin ø = 0.1388

ø = arcsin (0.1388)

ø = 7.983°

The ramp is palced at an angle ø = 7.983° with floor level