![]() So we need to take six times 15 for the pink rectangle, eight times 15 for the green rectangle, and 10 times 15 for the blue rectangle. Now we have the rectangles, and the area of a rectangle is length times width. So we can either take that and multiply by two or write it twice since we have two triangles. And it’s important that we know that that’s a right angle in the corner of the triangle, because that let’s us know that the six is indeed perpendicular. So for the two rectangles, we have one-half times their base of eight times their perpendicular height, which is six. The area of a triangle is one-half times the base times the height. So if we find the area of each of these shapes and we add them together, we will have the surface area. So here we’ve drawn the net of the shape. We have the bottom rectangle, and keep in mind that these are not to scale, and then lastly the blue rectangle. So we have these two triangles, which are our bases we have the pink rectangle, found back here and we have this length as 15, because it matches this one. So our hint tells us to draw the net of this shape, which would be all of the faces laying flat so we can easily see them. So if we would like the surface area of this shape, we need to add the area of all of the faces together. That’s what makes up a prism: the two bases and then the rest are rectangles. And it’s a prism because the rest of the faces or the sides is what we can call them are rectangles. The bases, the parallel faces, are triangles. So we have- that this is a triangular prism. Hint: you can draw the net of the shape to help you. In this particular case, we're using the law of sines.Find the surface area of this triangular prism. ![]() Here's the formula for the triangle area that we need to use:Īrea = a² × sin(Angle β) × sin(Angle γ) / (2 × sin(Angle β + Angle γ)) We're diving even deeper into math's secrets! □ In this particular case, our triangular prism area calculator uses the following formula combined with the law of cosines:Īrea = Length × (a + b + √( b² + a² - (2 × b × a × cos(Angle γ)))) + a × b × sin(Angle γ) ▲ 2 angles + side between You can calculate the area of such a triangle using the trigonometry formula: Now it's the time when things get complicated. ![]() We used the same equations as in the previous example:Īrea = Length × (a + b + c) + (2 × Base area)Īrea = Length × Base perimeter + (2 × Base area) ▲ 2 sides + angle between Where a, b, c are the sides of a triangular base ![]() This can be calculated using the Heron's formula:īase area = 0.25 × √, We're giving you over 15 units to choose from! Remember to always choose the unit given in the query and don't be afraid to mix them our calculator allows that as well!Īs in the previous example, we first need to know the base area.
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