From the information given in the question you may not assume that the shape is rectangular. It could, for example, be a isosceles triangle with sides of 7.3, 7.3 and 11.4 cm.
If two sides of a triangle have lengths of 5cm and 12cm, then the third side can have any length that's more than 7cm and less than 17cm. If the third side is 13cm, then the triangle is a right triangle.
34cm
If it's a 12 by 5 rectangle then the perimeter is: 12+5+12+5 = 34 cm
12+12=24 8+8= +16 The perimeter =40cm2
If it is an equilateral triangle with 3 equal sides of 4cm then its perimeter is 12cm
If it is an equilateral triangle with 3 equal sides of 4m then its perimeter is 12cm
If a right triangle has sides of 16Cm and 12Cm, the hypotenuse is: 20 cm
With 3cm for each sides.
12cm (4 sides x 3 = 12)
Isosceles
It will be a right angle triangle with a base of 3cm, a height of 4cm and a hypotenuse of 5cm
No
A right angle triangle fits the dimensions given
the perimeter is 36 and the area is 144
From the information given in the question you may not assume that the shape is rectangular. It could, for example, be a isosceles triangle with sides of 7.3, 7.3 and 11.4 cm.
If two sides of a triangle have lengths of 5cm and 12cm, then the third side can have any length that's more than 7cm and less than 17cm. If the third side is 13cm, then the triangle is a right triangle.