Block faces usually have a square, trapezoidal, rectangular, or triangular shape. Laminar microliths can also sometimes be described as trapezoidal, triangular or lunate. The trapezo-rhombic dodecahedron is a convex polyhedron with 6 rhombic and 6 trapezoidal faces. It may be square, triangular, trapezoidal, or other shapes. These pits were either trapezoidal or triangular in nature. The rear features a different bumper with trapezoidal, rather than circular, exhausts. They were mostly made of reeds and had a slightly curved trapezoidal section. The blade was made in trapezoidal or rounded rectangle shape. It takes the transient voltage signal and reshapes it into a Gaussian or trapezoidal shape. Right trapezoids are used in the trapezoidal rule for estimating areas under a curve. Cotes formulas, of which the rectangle rule and the trapezoidal rule are examples. The pectoral fins are short and roughly trapezoidal in shape. The first space is oval and the second trapezoidal. The pins and tails have a trapezoidal shape. The trapezoidal ailerons are near the wingtips.