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Q: What triangle has 7cm 7cm 7cm?

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No.

Two sides of a triangle are not sufficient to determine its area.

Scalene

No. The two shortest sides, 2cm and 4cm, add up to 6cm. 6 cm is shorter than 7cm, so those three sides will not make a triangle.

The height has not been given but the area of the triangle is: 0.5*height*base

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No.

The area of triangle is : 42.0

Two sides of a triangle are not sufficient to determine its area.

Area 51.

Scalene

Yes, it can. And if you do the math, some basic trigonometry, you can calculate the angles in the triangle.

No. The two shortest sides, 2cm and 4cm, add up to 6cm. 6 cm is shorter than 7cm, so those three sides will not make a triangle.

if it is a scalene triangle yes scalene triangle have no congruent sides and angles

It is: 3*7 = 21cm

17.5 cm2

A scalene triangle is simply a triangle where all of its sides are different lengths. One example of the side lengths of a scalene triangle are: 5cm, 6cm and 7cm

17.5cm squared