10,24,21 determine whether the triangle is acute, right, obtuse, or not a triangle

Step-by-step explanation:

Determining the type or triangle -

Acute - Acute angle triangle consists of angles less than 90° . that means all the three angles will be less than 90° .

Example =  60° ,60° ,60° .

Obtuse = These triangles consists of any one angle of more than 90°  and less than 180° . While other two will be acute angles .

Example = 110° ,40° ,30°

Right = Right angle Triangle consist of one angle measuring 90° .

Example =  90° , 45°  ,45°

Not a Triangle = When the sum of all three angles is not 180° then the figure is said to be not a triangle.

Element 17 is chlorine it is a group 7 element(halogen) and belongs to period 3 of the periodic table