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diff --git a/fuzzylite/src/term/Trapezoid.cpp b/fuzzylite/src/term/Trapezoid.cpp
new file mode 100644
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+++ b/fuzzylite/src/term/Trapezoid.cpp
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+/*
+ Author: Juan Rada-Vilela, Ph.D.
+ Copyright (C) 2010-2014 FuzzyLite Limited
+ All rights reserved
+
+ This file is part of fuzzylite.
+
+ fuzzylite is free software: you can redistribute it and/or modify it under
+ the terms of the GNU Lesser General Public License as published by the Free
+ Software Foundation, either version 3 of the License, or (at your option)
+ any later version.
+
+ fuzzylite is distributed in the hope that it will be useful, but WITHOUT
+ ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+ for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with fuzzylite.  If not, see <http://www.gnu.org/licenses/>.
+
+ fuzzylite™ is a trademark of FuzzyLite Limited.
+
+ */
+
+#include "fl/term/Trapezoid.h"
+
+namespace fl {
+
+    Trapezoid::Trapezoid(const std::string& name,
+            scalar vertexA, scalar vertexB, scalar vertexC, scalar vertexD, scalar height)
+    : Term(name, height), _vertexA(vertexA), _vertexB(vertexB), _vertexC(vertexC), _vertexD(vertexD) {
+        if (Op::isNaN(vertexC) and Op::isNaN(vertexD)) {
+            //TODO: Modify FLL to allow passing two parameters only.
+            this->_vertexD = _vertexB;
+            scalar range = _vertexD - _vertexA;
+            this->_vertexB = _vertexA + range * 1.0 / 5.0;
+            this->_vertexC = _vertexA + range * 4.0 / 5.0;
+        }
+    }
+
+    Trapezoid::~Trapezoid() {
+    }
+
+    std::string Trapezoid::className() const {
+        return "Trapezoid";
+    }
+
+    scalar Trapezoid::membership(scalar x) const {
+        if (fl::Op::isNaN(x)) return fl::nan;
+
+        if (Op::isLt(x, _vertexA) or Op::isGt(x, _vertexD))
+            return _height * 0.0;
+
+        if (Op::isLt(x, _vertexB))
+            return _height * Op::min(scalar(1.0), (x - _vertexA) / (_vertexB - _vertexA));
+
+        if (Op::isLE(x, _vertexC))
+            return _height * 1.0;
+
+        if (Op::isLt(x, _vertexD))
+            return _height * (_vertexD - x) / (_vertexD - _vertexC);
+
+        return _height * 0.0;
+    }
+
+    std::string Trapezoid::parameters() const {
+        return Op::join(4, " ", _vertexA, _vertexB, _vertexC, _vertexD)+
+                (not Op::isEq(_height, 1.0) ? " " + Op::str(_height) : "");
+    }
+
+    void Trapezoid::configure(const std::string& parameters) {
+        if (parameters.empty()) return;
+        std::vector<std::string> values = Op::split(parameters, " ");
+        std::size_t required = 4;
+        if (values.size() < required) {
+            std::ostringstream ex;
+            ex << "[configuration error] term <" << className() << ">"
+                    << " requires <" << required << "> parameters";
+            throw fl::Exception(ex.str(), FL_AT);
+        }
+        setVertexA(Op::toScalar(values.at(0)));
+        setVertexB(Op::toScalar(values.at(1)));
+        setVertexC(Op::toScalar(values.at(2)));
+        setVertexD(Op::toScalar(values.at(3)));
+        if (values.size() > required)
+            setHeight(Op::toScalar(values.at(required)));
+    }
+
+    void Trapezoid::setVertexA(scalar a) {
+        this->_vertexA = a;
+    }
+
+    scalar Trapezoid::getVertexA() const {
+        return this->_vertexA;
+    }
+
+    void Trapezoid::setVertexB(scalar b) {
+        this->_vertexB = b;
+    }
+
+    scalar Trapezoid::getVertexB() const {
+        return this->_vertexB;
+    }
+
+    void Trapezoid::setVertexC(scalar c) {
+        this->_vertexC = c;
+    }
+
+    scalar Trapezoid::getVertexC() const {
+        return this->_vertexC;
+    }
+
+    void Trapezoid::setVertexD(scalar d) {
+        this->_vertexD = d;
+    }
+
+    scalar Trapezoid::getVertexD() const {
+        return this->_vertexD;
+    }
+
+    Trapezoid* Trapezoid::clone() const {
+        return new Trapezoid(*this);
+    }
+
+    Term* Trapezoid::constructor() {
+        return new Trapezoid;
+    }
+
+
+}