This triangle has a side length and an angle involved, therefore you use trigonometry.
Remember these trigonometric functions:
sinθ= opposite/hypotenuse
cosθ= adjacent/hypotenuse
tanθ= opposite/adjacent
θ represents the angle.
1.4 cm is the adjacent side, because it’s next to the angle 70 degrees. x is the hypotenuse, because it’s opposite the right angle and it’s the longest side.
The function that involves the adjacent and hypotenuse side is cos.
cosθ= adjacent/hypotenuse
cos70=1.4/x
x(cos70)=1.4
x=1.4/cos70
put 1.4/cos70 into your calculator, and you should get 4.1cm to one decimal place.
Answer: x= 4.1 cm (to one decimal place)
(so sorry if i’m wrong!!!)