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Q: What tipe of triangle has sides 4cm 5cm and 4cm?

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A scalene triangle.

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This is the simplest Pythagorean Triple (52 = 32 + 42) so it's a right(-angled) triangle

yes it is. When you're dealing with the Pythagorean theory, a 3,4,5 triangle is a special triangle. For example, if a triangle has side lengths of 3cm and 4cm, then you automatically know that the other side length is 5cm. It also works if the side lengths are 5cm and 4cm or 5cm and 3cm.

A scalene triangle is a triangle that does not have a right angle in it (i.e. not a right angled triangle) and does not have two (or three) sides with the same length (i.e. not an isosceles triangle or an equilateral triangle). An example is a triangle with sides of length 4cm, 5cm and 6cm.

5cm

5cm

Because the sum of the squares of the smaller sides equals the square of the largest side: 32+42 = 25 and 52 = 25

5cm, 5cm, and 5cm could represent the lengths of the sides of an equilateral triangle, or might indicate the length, width, and height of a cube.

It will be a right angle triangle with a base of 3cm, a height of 4cm and a hypotenuse of 5cm

Area = 0.5*4*5 = 10 square cm

Using the cosine rule the biggest angle is: 82.81924422 degrees Using radius formula for circumcircle of a triangle the radius is: 3.023715784 cm

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