Answer:
surface area of the triangular prism = 984 mm²
Step-by-step explanation:
first of all, we know that area of triangle is given as;
1/2 x base x height.
Thus;
Each triangular face of the prism will have an area of ;
1/2 x 18 x 12 = 108mm²
Therefore, the two triangles will have a combined area of 108 x 2 = 216 mm².
Now, the perimeter of both identical isosceles triangles will be;
15 + 15 + 18 = 48mm
And since the length of these sides is 16mm,thus the area here will be 48 x 16 = 768 mm²
Thus total surface area of the prism = 216 + 768 = 984 mm²
Answer: The surface area of the triangular prism is 984mm^2
Step-by-step explanation:
A triangular prism normally has five components which are two triangles and three rectangles all fixed together to form a single shape.
To calculate the surface area of this triangular prism, we have to calculate the separate areas of the two triangles and the respective areas of the three rectangles and add them all up. The result thus, becomes the surface area of the shape ( the triangular prism).
The area of a triangle = 1/2 × base × height.
Where the base is 18mm and the height is 12mm
So, the area of one triangle = 1/2 × 12 × 18
= 108mm^2
Since the prism has two triangles, the area of the two triangles should be:-
108 × 2 = 216mm^2
Now, among the rectangles that made up the prism, two are identical. The formula for calculating the area of a rectangle = length × width;
Where: the length of one of the identical rectangles is 16mm and the width is 15mm.
The area of one of the two identical rectangles is = 16 × 15 = 240mm^2
The area of the two identical rectangles is then= 240 × 2 = 480mm^2
In the same manner, the length of the other rectangle is = 18mm and the width is 16mm
The area of this other rectangle is then= 18 × 16 = 288mm^2
The surface area of the prism is then:
288mm^2 + 480mm^2 + 216mm^2
= 984mm^2
