The diagram shows a right-angled triangle. x + 4
X-1
All the measurements are in centimetres.
The area of the triangle is 18 cm?
Work out the length of the shortest side of the triangle.
You must show all your working.

the answer is a.

135 and 80

step-by-step explanation:

i believe your answer is a

the figure is a concave pentagon.

step-by-step explanation:

in mathematical context, a pentagon is a flat, two-dimensional closed shape (polygon) with 5 straight sides and 5 angles.

now a pentagon is said to be concave if one or more corners bend inwards and at least one of its angles is 180 degrees or more than 180 degrees.

in the given figure, we can see that we have a corner which is bending inwards and an angle which is clearly greater than 180°. therefore, it is a concave pentagon.