Triangle ABC has perimeter 18 cm. AB = 7 cm
BC = 3 cm
By calculation, deduce whether triangle ABC is a right-angled triangle.

Please be quick,,it’s a test!!

AB= 7cm

BC=3cm

AC= x

Perimeter of triangle = AB + BC + AC

18 cm = 7cm + 3cm + X

18cm = 10cm + X

X = 18cm - 10cm

X = 8cm.

The pythagorean theorem states that in a right triangle a2 + b2 = c2, where c is the length of the hypotenuse (the longest side opposite to the right angle) and a and b are the lengths of the other two sides.

AC^2 = AB^2 + BC^2

8^2 =7^2 + 3^2

64 = 49 + 9

64 = 58

Since the equation is not true, we can deduce that ABC is NOT a right triangle.

idk

step-by-step explanation:

c.   x=2.4cm

step-by-step explanation:

similar triangles are triangles which have the same shape but not the same size. this means their angle measures are equal but their side lengths are not instead they are proportional. to solve, we will set up a proportion and solve.

a proportion is two equal ratios set equal to each other. we form the ratios by finding corresponding sides (sides which match to each other on both triangles by their position). out ratios will be one side of the small triangle over the corresponding side on the big triangle as shown below:

.

to solve the proportion, we'll cross multiply by multiplying numerator with denominator across the equal sign.