Algebra 1a: CST Review
WK7 (April 12): Area of Triangles, Parallelograms and Trapezoids
Triangle: `A = (bh)/2` or `A= 1/2(bh)` where `b` is the base and `h` is the vertical height. Sometimes it is useful to move the triangle around (rotate the page) to easily see the base and height.
Parallelogram: `A=bh`, where `b` is the base and `h` is the vertical height. This formula is similar to the area of a rectangle!
Trapezoid: `A=(h(a+b))/2`, or `A=1/2(h)(a+b)` where there are 2 bases, `a` and `b` and `h` is the vertical height. This formula has the divide by 2, just like the triangle.
Worksheet 12-1, page 100 has 15 problems to practice with! You might find an electronic calculator useful.
WK6 (April 11): Area and Perimeter of Triangles
The area of a triangle, `A = (bh)/2` where `b` is the base and `h` is the vertical height.
The perimeter of a triange is the sum of all 3 sides, just add them up to find the distance AROUND the triangle!
Worksheet D-56 and CC-51 are good practice. CC-51 provides both sides `a` and `b`, you have to solve for `c`, the hypotenuse (`c=sqrt(a^2+b^2)`)!