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GeomBench
Base × side × sin(angle) — with a live to-scale diagram.
A parallelogram's area is base × height, but height isn't always given directly. If you know the slant side and the angle it makes with the base, height = side × sin(angle) — so area = base × side × sin(angle) in one step.
Parallelogram area appears in physics (force/torque parallelograms), land surveying for skewed plots, and engineering when components meet at an angle rather than square.
Area
37.588
What you entered
Height from the slant side and angle
5 × sin(70°)= 4.6985Area = base × height
8 × 4.6985= 37.5877Perimeter
2 × (8 + 5)= 26Result
Area: 37.588
A parallelogram with base 8, side 5, and a 70° angle between them has an area of 37.588 and a perimeter of 26.